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Investments - Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Jun. 12, 2020
Dec. 31, 2020
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance     $ 39
Provision for loan losses   $ 32 (8)
For initial credit losses on purchased loans accounted for as PCD financial assets $ 7   0
Ending Balance   39 31
Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance     37
Provision for loan losses   30 (12)
For initial credit losses on purchased loans accounted for as PCD financial assets 7   0
Ending Balance   37 25
Commercial Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance     2
Provision for loan losses   2 4
For initial credit losses on purchased loans accounted for as PCD financial assets $ 0   0
Ending Balance   $ 2 $ 6